Boris Johnson: I brilliantly decided to come to a juddering halt

You may remember a long time ago, I fell in a river in order to promote volunteering. It was in exactly the same spirit that I brilliantly decided to come to a juddering halt in the middle of the zipwire in order to promote our wonderful live site at Victoria Park. Get on down to Victoria Park, folks. Free entertainment, hog roast, you name it. It turned out I was the Yuri Gagarin of the zipwire. I was testing it.